Initial experimental import of bq resampler

src/dsp/Resampler.h

@@ -1,4 +1,4 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+//* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
 
 /*
     Rubber Band Library
@@ -32,6 +32,9 @@ class Resampler
 {
 public:
     enum Quality { Best, FastestTolerable, Fastest };
+    enum Dynamism { RatioOftenChanging, RatioMostlyFixed };
+    enum RatioChange { SmoothRatioChange, SuddenRatioChange };
+    
     enum Exception { ImplementationError };
 
     struct Parameters {
@@ -41,6 +44,22 @@ public:
          */
         Quality quality;
 
+        /**
+         * Performance hint indicating whether the ratio is expected
+         * to change regularly or not. If not, more work may happen on
+         * ratio changes to reduce work when ratio is unchanged.
+         */
+        Dynamism dynamism; 
+
+        /**
+         * Hint indicating whether to smooth transitions, via filter
+         * interpolation or some such method, at ratio change
+         * boundaries, or whether to make a precise switch to the new
+         * ratio without regard to audible artifacts. The actual
+         * effect of this depends on the implementation in use.
+         */
+        RatioChange ratioChange;
+        
         /** 
          * Rate of expected input prior to resampling: may be used to
          * determine the filter bandwidth for the quality setting. If
@@ -67,6 +86,8 @@ public:
 
         Parameters() :
             quality(FastestTolerable),
+            dynamism(RatioMostlyFixed),
+            ratioChange(SmoothRatioChange),
             initialSampleRate(44100),
             maxBufferSize(0),
             debugLevel(0) { }